420781781 has 8 divisors (see below), whose sum is σ = 481091520. Its totient is φ = 360521568.

The previous prime is 420781763. The next prime is 420781783. The reversal of 420781781 is 187187024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420781781 - 2¹⁸ = 420519637 is a prime.

It is a super-2 number, since 2×420781781² = 354114614443063922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420781783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8090 + ... + 30116.

It is an arithmetic number, because the mean of its divisors is an integer number (60136440).

Almost surely, 2^420781781 is an apocalyptic number.

It is an amenable number.

420781781 is a deficient number, since it is larger than the sum of its proper divisors (60309739).

420781781 is a wasteful number, since it uses less digits than its factorization.

420781781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24763.

The product of its (nonzero) digits is 25088, while the sum is 38.

The square root of 420781781 is about 20512.9661677681. The cubic root of 420781781 is about 749.3516061272.

The spelling of 420781781 in words is "four hundred twenty million, seven hundred eighty-one thousand, seven hundred eighty-one".